Which water pump should I run for an LS swap: truck pump or Camaro pump?

It depends on your accessory drive spacing and whether your engine has VVT — the pump has to match the balancer and brackets you're running.

Pump	Spacing	Gen	Outlet	Clears a VVT timing cover	Example part
LS1 water pump	-1	Gen III	car style	No	ICT WAT200
LS3/LSA/LS7 Corvette pump	-1	Gen IV	car style	No	ICT WAT101
Gen III truck pump	-3	Gen III	vertical outlet on top	No	ICT WAT300
Gen IV truck pump	-3	Gen IV	vertical outlet on top	Yes	ICT WAT301
LS3/L99 Camaro pump	-3	Gen IV	outlet upper driver side	Yes	ICT WAT302

How to choose:

• Match the spacing of your balancer and accessory brackets: -1 (Corvette/car), -2 (F-body Camaro/Firebird), -3 (truck). Mixing spacings misaligns the belt — see the accessory spacing picker.
• VVT engines (many Gen IV trucks): only the Gen IV truck pump and the LS3/L99 Camaro pump clear the VVT timing cover, per ICT Billet.
• The LS1 pump is the most flexible: direct fit on -1 and -2 drives and usable on -3 with ICT's spacers, but it doesn't clear a VVT cover.
• Outlet position matters for hood and radiator hose routing: truck pumps have a vertical outlet on top; car pumps route differently. Most LS water pumps have both inlet and outlet on the passenger side; LS swap radiators put both ports on the passenger-side tank.

See the accessory drive guide.